The best I can describe their guidelines, after seeing various posts in the past, is this:
-If you have an LGBT character, they have to be human. Having LGBT characters that are monsters and demons is literally dehumanizing.
-If your character is an ethnic minority or LGBT, they cannot have any negative or stereotypical traits or flaws. They can’t be aggressive, sleazy, manipulative, etc.
-The above goes double if you’re using non human characters like elves, animals or aliens. Coding is a thing and they will drag you for it.
-Your character of whatever minority must never be in the wrong and the characters and show must always agree with their viewpoint.
-Minority characters can never go through hardships or lose at anything, ever. Real life minorities already live through hardships, fictional characters shouldn’t go through that. /sneed
TL; DR It’s just positive discrimination; minority characters must be inoffensive and just relatable enough for a social media audience. Shep from Steven Universe is basically their ideal model of a minority character.
Course, it’s not always consistent and people will still find some “Gotcha” even if you follow all the rules.
Edit: Had to add one addendum to the rules.